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create.go
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create.go
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package commands
import (
"bytes"
"context"
"encoding/csv"
"fmt"
"net/url"
"os"
"strings"
"time"
"github.com/docker/buildx/driver"
"github.com/docker/buildx/store"
"github.com/docker/buildx/store/storeutil"
"github.com/docker/buildx/util/cobrautil"
"github.com/docker/buildx/util/confutil"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/google/shlex"
"github.com/moby/buildkit/util/appcontext"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
type createOptions struct {
name string
driver string
nodeName string
platform []string
actionAppend bool
actionLeave bool
use bool
flags string
configFile string
driverOpts []string
bootstrap bool
// upgrade bool // perform upgrade of the driver
}
func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
ctx := appcontext.Context()
if in.name == "default" {
return errors.Errorf("default is a reserved name and cannot be used to identify builder instance")
}
if in.actionLeave {
if in.name == "" {
return errors.Errorf("leave requires instance name")
}
if in.nodeName == "" {
return errors.Errorf("leave requires node name but --node not set")
}
}
if in.actionAppend {
if in.name == "" {
logrus.Warnf("append used without name, creating a new instance instead")
}
}
buildkitHost := os.Getenv("BUILDKIT_HOST")
driverName := in.driver
if driverName == "" {
if len(args) == 0 && buildkitHost != "" {
driverName = "remote"
} else {
var arg string
if len(args) > 0 {
arg = args[0]
}
f, err := driver.GetDefaultFactory(ctx, arg, dockerCli.Client(), true)
if err != nil {
return err
}
if f == nil {
return errors.Errorf("no valid drivers found")
}
driverName = f.Name()
}
}
if driver.GetFactory(driverName, true) == nil {
return errors.Errorf("failed to find driver %q", in.driver)
}
txn, release, err := storeutil.GetStore(dockerCli)
if err != nil {
return err
}
defer release()
name := in.name
if name == "" {
name, err = store.GenerateName(txn)
if err != nil {
return err
}
}
if !in.actionLeave && !in.actionAppend {
contexts, err := dockerCli.ContextStore().List()
if err != nil {
return err
}
for _, c := range contexts {
if c.Name == name {
logrus.Warnf("instance name %q already exists as context builder", name)
break
}
}
}
ng, err := txn.NodeGroupByName(name)
if err != nil {
if os.IsNotExist(errors.Cause(err)) {
if in.actionAppend && in.name != "" {
logrus.Warnf("failed to find %q for append, creating a new instance instead", in.name)
}
if in.actionLeave {
return errors.Errorf("failed to find instance %q for leave", name)
}
} else {
return err
}
}
if ng != nil {
if in.nodeName == "" && !in.actionAppend {
return errors.Errorf("existing instance for %s but no append mode, specify --node to make changes for existing instances", name)
}
}
ngOriginal := ng
if ngOriginal != nil {
ngOriginal = ngOriginal.Copy()
}
if ng == nil {
ng = &store.NodeGroup{
Name: name,
}
}
if ng.Driver == "" || in.driver != "" {
ng.Driver = driverName
}
var flags []string
if in.flags != "" {
flags, err = shlex.Split(in.flags)
if err != nil {
return errors.Wrap(err, "failed to parse buildkit flags")
}
}
var ep string
var setEp bool
if in.actionLeave {
if err := ng.Leave(in.nodeName); err != nil {
return err
}
} else {
switch {
case driverName == "kubernetes":
// naming endpoint to make --append works
ep = (&url.URL{
Scheme: driverName,
Path: "/" + in.name,
RawQuery: (&url.Values{
"deployment": {in.nodeName},
"kubeconfig": {os.Getenv("KUBECONFIG")},
}).Encode(),
}).String()
setEp = false
case driverName == "remote":
if len(args) > 0 {
ep = args[0]
} else if buildkitHost != "" {
ep = buildkitHost
} else {
return errors.Errorf("no remote endpoint provided")
}
ep, err = validateBuildkitEndpoint(ep)
if err != nil {
return err
}
setEp = true
case len(args) > 0:
ep, err = validateEndpoint(dockerCli, args[0])
if err != nil {
return err
}
setEp = true
default:
if dockerCli.CurrentContext() == "default" && dockerCli.DockerEndpoint().TLSData != nil {
return errors.Errorf("could not create a builder instance with TLS data loaded from environment. Please use `docker context create <context-name>` to create a context for current environment and then create a builder instance with `docker buildx create <context-name>`")
}
ep, err = storeutil.GetCurrentEndpoint(dockerCli)
if err != nil {
return err
}
setEp = false
}
m, err := csvToMap(in.driverOpts)
if err != nil {
return err
}
if in.configFile == "" {
// if buildkit config is not provided, check if the default one is
// available and use it
if f, ok := confutil.DefaultConfigFile(dockerCli); ok {
logrus.Warnf("Using default BuildKit config in %s", f)
in.configFile = f
}
}
if err := ng.Update(in.nodeName, ep, in.platform, setEp, in.actionAppend, flags, in.configFile, m); err != nil {
return err
}
}
if err := txn.Save(ng); err != nil {
return err
}
ngi := &nginfo{ng: ng}
timeoutCtx, cancel := context.WithTimeout(ctx, 20*time.Second)
defer cancel()
if err = loadNodeGroupData(timeoutCtx, dockerCli, ngi); err != nil {
return err
}
for _, info := range ngi.drivers {
if err := info.di.Err; err != nil {
err := errors.Errorf("failed to initialize builder %s (%s): %s", ng.Name, info.di.Name, err)
var err2 error
if ngOriginal == nil {
err2 = txn.Remove(ng.Name)
} else {
err2 = txn.Save(ngOriginal)
}
if err2 != nil {
logrus.Warnf("Could not rollback to previous state: %s", err2)
}
return err
}
}
if in.use && ep != "" {
current, err := storeutil.GetCurrentEndpoint(dockerCli)
if err != nil {
return err
}
if err := txn.SetCurrent(current, ng.Name, false, false); err != nil {
return err
}
}
if in.bootstrap {
if _, err = boot(ctx, ngi); err != nil {
return err
}
}
fmt.Printf("%s\n", ng.Name)
return nil
}
func createCmd(dockerCli command.Cli) *cobra.Command {
var options createOptions
var drivers bytes.Buffer
for _, d := range driver.GetFactories() {
if len(drivers.String()) > 0 {
drivers.WriteString(", ")
}
drivers.WriteString(fmt.Sprintf(`"%s"`, d.Name()))
}
cmd := &cobra.Command{
Use: "create [OPTIONS] [CONTEXT|ENDPOINT]",
Short: "Create a new builder instance",
Args: cli.RequiresMaxArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
return runCreate(dockerCli, options, args)
},
}
flags := cmd.Flags()
flags.StringVar(&options.name, "name", "", "Builder instance name")
flags.StringVar(&options.driver, "driver", "", fmt.Sprintf("Driver to use (available: %s)", drivers.String()))
flags.StringVar(&options.nodeName, "node", "", "Create/modify node with given name")
flags.StringVar(&options.flags, "buildkitd-flags", "", "Flags for buildkitd daemon")
flags.StringVar(&options.configFile, "config", "", "BuildKit config file")
flags.StringArrayVar(&options.platform, "platform", []string{}, "Fixed platforms for current node")
flags.StringArrayVar(&options.driverOpts, "driver-opt", []string{}, "Options for the driver")
flags.BoolVar(&options.bootstrap, "bootstrap", false, "Boot builder after creation")
flags.BoolVar(&options.actionAppend, "append", false, "Append a node to builder instead of changing it")
flags.BoolVar(&options.actionLeave, "leave", false, "Remove a node from builder instead of changing it")
flags.BoolVar(&options.use, "use", false, "Set the current builder instance")
// hide builder persistent flag for this command
cobrautil.HideInheritedFlags(cmd, "builder")
return cmd
}
func csvToMap(in []string) (map[string]string, error) {
m := make(map[string]string, len(in))
for _, s := range in {
csvReader := csv.NewReader(strings.NewReader(s))
fields, err := csvReader.Read()
if err != nil {
return nil, err
}
for _, v := range fields {
p := strings.SplitN(v, "=", 2)
if len(p) != 2 {
return nil, errors.Errorf("invalid value %q, expecting k=v", v)
}
m[p[0]] = p[1]
}
}
return m, nil
}